28400704 has 14 divisors (see below), whose sum is σ = 56357774. Its totient is φ = 14200320.

The previous prime is 28400663. The next prime is 28400717. The reversal of 28400704 is 40700482.

It can be written as a sum of positive squares in only one way, i.e., 24206400 + 4194304 = 4920^2 + 2048^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221817 + ... + 221944.

Almost surely, 2^28400704 is an apocalyptic number.

It is an amenable number.

28400704 is a deficient number, since it is larger than the sum of its proper divisors (27957070).

28400704 is an equidigital number, since it uses as much as digits as its factorization.

28400704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443773 (or 443763 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 28400704 is about 5329.2310890034. The cubic root of 28400704 is about 305.1005813573.

The spelling of 28400704 in words is "twenty-eight million, four hundred thousand, seven hundred four".